Influence of Scandium on Microstructures and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloys

The microstructures and mechanical properties of as-extruded Mg–2.3Zn–0.18Y–[Formula: see text]Zr ([Formula: see text] = 0.03, 0.06 and 0.13 at.%) alloys and aged Mg–2.3Zn–0.18Y–0.13Zr alloy were studied. The results revealed that the microstructures of as-extruded Mg–2.3Zn–0.18Y–[Formula: see text]Zr alloys are typical bimodal structures. The coarse [Formula: see text]-Mg grains are surrounded by fine dynamically recrystallized [Formula: see text]-Mg grains. The average size of [Formula: see text]-Mg grains decreases with increasing Zr content. Moreover, the addition of Zr (at.%) can improve the mechanical properties of alloy. The as-extruded Mg–2.3Zn–0.18Y–0.13Zr alloy has the best mechanical properties with ultimate tensile strength (UTS) and yield strength (YS) of 346 MPa and 292 MPa, respectively, and an elongation of 26.7%, which can be attributed to the grain refining effect and precipitate strengthening. The UTS and elongation of Mg–2.3Zn–0.18Y–0.13Zr alloy changed slightly after aging treatment, but the YS increases remarkably, with the maximum increase of 30 MPa. The fracture surfaces of all alloys consist of many tearing ridges and dimples.

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Microstructures and mechanical properties of Mg-Gd-Zn-Zr alloys prepared by spark plasma sintering

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.153405 ◽

2020 ◽

Vol 820 ◽

pp. 153405 ◽

Cited By ~ 2

Author(s):

Yuanhang Luo ◽

Yujuan Wu ◽

Qingchen Deng ◽

Yu Zhang ◽

Juan Chen ◽

...

Keyword(s):

Mechanical Properties ◽

Spark Plasma Sintering ◽

Plasma Sintering ◽

Spark Plasma ◽

Microstructures And Mechanical Properties ◽

Zr Alloys

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Study on Microstructures and Mechanical Properties of Die Casting Mg-xGd-3Y-0.5Zr Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.44 ◽

2013 ◽

Vol 690-693 ◽

pp. 44-48

Author(s):

Feng Wang ◽

Zhi Wang ◽

Zheng Liu ◽

Ping Li Mao

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Tensile Strength ◽

Solution Heat Treatment ◽

Die Casting ◽

Solution Treatment ◽

Small Variation ◽

Strength Increase ◽

Microstructures And Mechanical Properties ◽

Zr Alloys

In this paper, developed a non-aluminum die casting magnesium alloys were studied based on Mg-xGd-Y-Zr（x=6, 8, 12 wt.%）alloys in cold chamber press. The microstructures and mechanical properties of die casting GWK alloys have been investigated using OM, SEM, XRD, EDS and mechanical property test. The experimental results show that with increasing Gd content of Mg-xGd-Y-Zr alloys, the tensile strength increase, but elongation decrease. In particular, die casting GWK alloys after short-term and low-temperature solid solution treatment (T4) have a small variation in grain size and more uniform microstructures, and the second phases distribute at the grain boundaries in form of discontinuous rod shape or granule shape, which result in an obvious improvement in tensile mechanical properties of alloys. The Mg-12Gd-3Y-0.5Zr die casting alloy exhibit maximum tensile strength after solution heat treatment, and the value is 269MPa at room temperature. The effect of solution heat treatment on die casting Mg-xGd-Y-Zr alloys was also discussed.

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